Q: I have cultivated Clivia plants. The leaves begin to dry out after the tips of the leaves begin to yellow and gradually develop towards the roots. What are the reasons? How to treat? A: The disease that may occur in your Gentleman leaf may be Clivia leaf spot. The disease mostly occurred on the leaves. The lesions started as faded green macula. The surrounding tissues turned yellow-green. The lesions continued to enlarge and showed irregular irregular spots. The edges of the lesions were brownish-brown and gray-brown. Black granulates appeared on the back of the late lesions, and eventually the disease was dry. The pathogens survive on the remains of host plants and are more likely to infect from the wound. Occurs all the year round in the greenhouse, with the most severe onset from July to October. When the growth of plants is debilitated, it is beneficial to the occurrence of the disease. Control methods: 1 Cut off the diseased part (to take a part of the green leaves) and destroy it in time; 2 In the onset period, use 50% carbendazim WP 1000 times, or 70% thiophanate-methyl WP 1500 times, Or 50% of dexsenun wettable powder 1000 times, alternately, once every 10 days, 2 times to 3 times in succession. China Agricultural Network Editor